Speed-meter.



PATRNTED MAR. 27, 1906.

R. W. HARGRAVB.

SPEED METER.

MPucsurmu FILED MAY 2:,

G, which runs in the bearing-sleeve F and is by the gears W and V. The cap Y c oses the f is a screw for the. 'adiustment of the spin .v `the rotation oft e Whee is fastenedLtofhe'spindle L. The other end vis fastened in the clam M,- whichmey be rotated about the screw i I inwhichf f at right angles to the axis of the cases and loo Atmvard the handleC.

views.

UNITED STATES PATENT OFFICE.

RUSSELL W. HARGVE, OF ANN ARBOR, MICHIGAN.

SPEED- No. 816,089. Speciication of METER.

Letters Patent. Patented March 27, 1908,.

Appunti@ ned my 22, 1905. serai in. comm.

To @ZZ whom :it may concern;

Be it known that I, RUSSELL WXLLIAM Hanemivr., a citizen of the United States, residing at Ann Arbor, in the county of Washtenaw and State of Michigan, have invented s. new and useful S eed-Meter, of which the foiiowing is a speci ication.

My invention is a speed-meter in which a fan-wheel produces and circuietes currents of air or gas in an ineiosed case, which currents acting upon e second fan-wheel causel it to rotate against the restraining action of a sjpring, the amount of this rotation being in:

icated by graduations.

The object of in invention is to measure speed, which I do means of the mechanism iilustrated in t 1e accompanying drawigure i is a partial section taken through Fig.

Simi ar letters refer to similar parts in both The casing Aforms the main framework of the machine. In one end of this is fastened the cap B, to which may be fastened 'the handie G. 'The other end of the casing contains the mechanism for driving the fan-wheel E. Tiu's mechanism consists of the main spindle direct-.connected to fan-wheel E, the `Janxiliary s indie I, which is connected to the spindie G y the gears X and U, and the auxiha spindle H, which is connected to s indie rg outer end of this-case. Upon the outer end of either I, G, or H is placed any suitable device as.R, for connectin the meter to the mechanism the speed of w 'ch is desired.

O'and P are braces 'which support parts of the inner eas' N- end Atheiiearin y of the pindle L. To is fastened the ari-wheel The periphery of D is formed by the rim T 1 1 on which are placed the aduations,' whic can be read throu h the g ass or other trans arent substance 'w 'ch closes the openin thecase. f

die L. K is s ring oi` s rings for resist' ne end of of the zero of the graduations.l

plete circulation and separationo the oppositely travelin currents produced bj the fan-wheel E. gIhediierent parts of are supported by P, 0, and the end of the casing A. Fan-wheel E is a double wheel having inner and outer vanos so formed asy to produce when rotated currents appoximateiy equal in velocit but opposite in direction, at the inner an outer portions of the Wheel, es shown b the arrows on-the "clra Fan-Wheel has venes similar to those o E and when acted upon by the opA 1.sitel moving currents produced by E rotates, t e amount of this rotation being indicated' by the graduations u on its rim, thus indicating the speed. For t e sake of simplicitythese ble'vanes, respectively, but mayhave any number of vanos desired.

The assage S is formed as shown to reduce friction and the formation of eddy-curpassage, the object being to produce currents the velocity of which will be as nearly proportional to the speed of rotation of E as posgreater ecnsitiveness produced by the use of the d able ian-wheel. V I* wiii of course be understood that many taiis ofrconstruction without departing from m invention.

at I claim es m invention'.` and desire to secure by Letters atout, is'

f 1. The combination in a speed-meterof an posite pitches at 'their tions, corresponding portions ci the yenes of uach fenhaving the-same p1tch,substimtiay es described. e

and outer por.

as a centcrand iixedA inclosed case iuwhich are arranged coaxially and to 'rotate two fenahaving venes with opi 2. The combination in e. speed-meter of a" cese in which, are arranged coaxially'and to in any angular position to adjust the location N is an inner casing to assist in the conramwheels are shown with two orvfour 'dou- Vrents as much as possibie and also to equally deflect the currents striking the ends of thei sible, and these willV therefore producekin D meter is also van improvement because of the 9g variatiom may bevmade' in the form and de- 

